From mboxrd@z Thu Jan 1 00:00:00 1970 From: mina86@mina86.com (Michal Nazarewicz) Date: Wed, 08 Feb 2012 10:21:18 +0100 Subject: [Linaro-mm-sig] [PATCH 11/15] mm: trigger page reclaim in alloc_contig_range() to stabilize watermarks In-Reply-To: References: <1328271538-14502-1-git-send-email-m.szyprowski@samsung.com> <1328271538-14502-12-git-send-email-m.szyprowski@samsung.com> <20120203140428.GG5796@csn.ul.ie> Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Wed, 08 Feb 2012 03:04:18 +0100, sandeep patil wrote: > There's another problem I am facing with zone watermarks and CMA. > > Test details: > Memory : 480 MB of total memory, 128 MB CMA region > Test case : around 600 MB of file transfer over USB RNDIS onto target > System Load : ftpd with console running on target. > No one is doing CMA allocations except for the DMA allocations done by the > drivers. > > Result : After about 300MB transfer, I start getting GFP_ATOMIC > allocation failures. This only happens if CMA region is reserved. [...] > Total memory available is way above the zone watermarks. So, we ended > up starving > UNMOVABLE/RECLAIMABLE atomic allocations that cannot fallback on CMA region. This looks like something Mel warned me about. I don't really have a good solution for that yet. ;/ -- Best regards, _ _ .o. | Liege of Serenely Enlightened Majesty of o' \,=./ `o ..o | Computer Science, Micha? ?mina86? Nazarewicz (o o) ooo +------------------ooO--(_)--Ooo--